Does anyone know if the explanation for question 10 in the Math: Eq, Ineq, VIC book is wrong? I noticed that in the second example it states that: (81)[9a + b/4 = x/9 = 9] translates into 729a + 20.25b + 9x = 9. Shouldn't it be 729a = 20.25b + 9x = 729? I'm sorry if this is a stupid question, but at this point I can't think straight right now. I worked too many hours this week.

Thanks

Yep, it's a typo. You are correct. Thanks for catching that. (Fortunately, you don't need to actually solve this system of equations!)

Rey